tools = {
    "get_current_time": {
        "name": "get_current_time",
        "description": "Get current time",
        "inputSchema": {
            "type": "object",
            "properties": {
                "format": {
                    "type": "string",
                    "description": "Time format (optional)",
                    "enum": ["iso", "timestamp", "readable"],
                }
            },
        },
    },
    "calculate": {
        "name": "calculate",
        "description": "Perform simple mathematical calculations",
        "inputSchema": {
            "type": "object",
            "properties": {
                "expression": {
                    "type": "string",
                    "description": "Mathematical expression, e.g. '2 + 3 * 4'",
                }
            },
            "required": ["expression"],
        },
    },
    "echo": {
        "name": "echo",
        "description": "Echo input message",
        "inputSchema": {
            "type": "object",
            "properties": {
                "message": {"type": "string", "description": "Message to echo"}
            },
            "required": ["message"],
        },
    },
}
